You can edit liveupdate.conf and add the following lines to the bottom of the file (each on their own line)
proxy=<IP of proxy server>:<port of proxy server>
proxyusername=<username>
proxypassword=<password>

At proxy= type the proxy server host name or IP address and the port number (separated by a colon).
You must use the following format: <servername>:<portnumber>
where <servername> is the IP address or host name of the proxy server, and <portnumber> is the appropriate port.

NOTE: The proxyusername and proxypassword are optional. If you do not need to specify a user name and password then do not add those lines.

Vikram Kumar

Symantec Consultant

The most helpful part of entire Symantec connect is the Search button..do use it.